Outboard motor control



Oct. 31, 1933. l F T "zzgl-:NS 1,932,521

OUTBOARD MOTOR CONTROL Fil'ed Nov. 8, 1929 Patented @ce si, i933 1,932,521 OUTBOD MGTOR, CNTEGL Finn T. `Ergens, Milwaukee, Wis., assigner to Outboard Motors Corporation, Wis., a corporation of Michigan Milwaukee,

Application November 8, 1929. Serial No. 405,551

1 cream. (ci. iis-,17)

control member which combines the functions.

of throttl'ing and choking.

It is very important to the present invention S that the several controls above mentioned are so disposed onthe tiller as to'leave the grip portion thereof entirely free and unencumbered. It

is very desirable to provide a rotary control han-v dle because such' a control is lmanipulated naturally by most operators. If such rotary handle be employed also as a tiller grip, however, theV arrangement is objectionable in that the operator will unconsciously rotate the grip in manipulating the tiller. It4 is, therefore, an important object of the invention to provide a carburetion and mixture control in the form of a sleeve mounted on the tiller handle in a position offset from the normally engaged grip portion of such handle but within reach of the operators hand o so that it may be manipulated without releasing Another object of the invention relates to the means through which control of the engine is effected. In' this particular it is my purpose to `e; provide a manifold system which includes a plurality of manifold passages leadingfrom the earbureter tothe engine. In the two cycle, two

cylinder engine disclosed both of these passages lead to the crank case. Each is controlled in ,0 the usual way by the piston in the particular cylinder through which the respective passage counicateswith the crank case.

The chief lpurpose in providing a multiplicity of manifold passages is to maintain more efficient L5 atomization of fuel by keeping a more constant flowof mixture through `each given manifoldl passage which is in operation during the throttlingof the engine; Instead of reducing the amount of mixture admittedto a single passage I i0 am able.' by the invention herein disclosed, successively to cut off a series of passages whereby the remaining passage will in any given case retain high mixture velocity which will prevent the settling 'or deposit of atomized fuel on the 55 wall of the manifold.

Another advantage o f the dual manifold arrangement herein disclosed consists in the fact that a modern high speed two cycle engine effects compression as far as possible in the lower ends of the cylinders, the crank case being filled as far4 as possible-with the crank andassociated parts. `When the engine is running throttled such parts do not-materially interfere with the transfer of the gas from one cylinder to another through the crank case. When the engine is running at full capacity charges of gas are delivered .by the several manifolds directly to the preliminary compression space in the cylinders in which the gas is ultimately consumed.

In the drawing:

Figure l is a perspective View in elevation of' an outboard motor embodying the invention.

Figure 2 is a detail View in partial section through the carbureter mixing ychamber and manifold system.

Figure 3 is a detail in cross section through the mixture control device.

Like parts are identified by the same reference characters -throughout the several views.

rIhe outboard motor shown comprisesa bracket 5 having a bearing sleeve 6in which vthe motor assembly is unitarily dirigible. The drive shaft housing sleeve 7 connects the submersible lower unit 8 with the engine which includes cylinders 9' and 10,l magneto fly Wheel 11, fuel tank 12 and 1.a carbureter including oat chamber 13, mixing and control chamber 14, air inlet 1 5 and manifolds 16 and 1'7.

A bracket 20 secured to the engine provides a pivot `at 21 upon which the tiller grip 22 is mounted to swing upwardly from the position in which it is illustrated, this arrangement being common practice. It is also common to provide in the tiller grip a push button 23 for ground=4 ing the magneto to interrupt the ignition when it is desired to stop the engine suddenly. This arrangement is such that the operator grasping the tiller. grip 22 will have full control of the rotative or angular position of the motor in its bearing sleeve 6 while keeping the button 23 immediately under lhis thumb.v

Mounted on the tiller 4immediately behind the grip portion 22 thereof isa throttle and choke control in the form of sleeve 25 which, for convenient manipulation, may be provided with -knurling at 26. It will be obvious that without releasing the tiller the operator can slide his hand rearwardly to engage sleeve 25 and can thereby manipulate the throttle or choke through mechanism hereinafter to be described.

tov

leo

An arm 27 mounted on the sleeve 25 is universally connected at 28 with a rod or link 29 which at itsl other end is pivotally connected at 30 to the carbureter control disc 31. This disc is rotatable on the front of the control and mixing chamber 14 above referred to and is connected to impartrotative movement to a segment shaped valve member 35 which is mounted to rotate within a cylinder portion of chamber 14.

Figure 2 shows' the valve in the normal intermediate position which it occupies when the engine is operating at full capacity. If rotated in a clockwise direction from positionin which valve member 35 is shown this member may be used to cut off .the air admission port 15 to any desired degree. If oscillated in a counterclockwise direction from the position in which it is illustrated in Figure 2 the valve member 35 may obviously be used to cut off manifold 16 to any desired degree and subsequently to cut ol manifold 17 to any desired degree. Regardless of the number of manifold passages employed, a valve such as that shown Will move across them successively so that the resulting constriction of any given passage Will be 10W as compared with the total area available for 'the flow of mixture. Thus high mixture velocity will be maintained in any passage not yet cut olf by the manipulation of valve 35.

Since, in the particular device herein disclosed, the manifold passages 16 and 17 lead to the inner ends of respective cylinders which are in communication with each `other the result will be to supply mixture to both cylinders regardless of whether one manifold is completely cut off and the mixture will be more uniform than would be the case if the velocity of flow were permitted to drop through throttling a single and relatively large manifold passage.

A fuel duct 3.6 leads from the float chamber 13 to a nozzle 37 located in the convex wall portion 38 of the mixing and control chamber lll. This disposition of the nozzle Within the arc traversed by the valve 35 makes possible the use of a single valve member for both choking and throttling effects as above described. t leaves the nozzle fully exposed to such air as flows through the mixing chamber when valve 35 is used for throttling and it leaves the nozzle exposed to depressions produced in the mixing chamber by the operation of the engine when the valve 35 is moved across the air inlet 15 for choking. Preferably the vvalve I 35 is provided with a port at 39 of such diameter as to admit enough mixture to the last manifold closed by the valve so that the engine will idle. This port is located near the edge of the valve which -leads in its counterclockwise throttling movement so that the port is not exposed when the valve is used as a'choke.

Because of the control assembly above described it will be obvious that the operator of an outboard'motor equipped in accordance with the disclosure herein can control the entire operation of the motor as Well as accomplish steering of the boat to which the motor is applied with the use of a single hand. At the same time the operator is relieved of the burden of maintaining the throttle and choke control in any given setting. The arrangement is such that these parts will remain in any position to which they have been adjusted and due to the disposition of sleeve 25 in od set -relation to the tiller grip 22 there is no danger of -inadvertent manipulation of the control' parts. Sleeve 25 constitutes in effect an auxiliary grip for the tiller which is effected to maintain tiller control even While manipulation to control an engine function.

I claim:

The combination with an outboard motor structure dirigibly mounted, of a tiller pivotally connected with said structure for hinged movement in an upright plane with respect thereto while available in all positions for dirigible control thereof, said tiller having a relatively xed portion and a relatively movable coaxial portion, a lever carried by the movable portion of the tiller adjacent the fulcrum of its hinged movement, an engine ,control spaced laterally from said tiller and provided with a lever arm and an inflexible link pivoted betweenthe rst and second mentioned levers for the operative transmission of movement to said control irrespective of the hinged adjustment of the tiller.

FINN T. IRGENS. 

